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→SolidWorks
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<strong>Step 11:</strong> .
<strong>Step 11:</strong> Select the triangular area, go to the Features tab, and click on Extruded Cut. In the left column, check the box for Direction 2 so that the extruded cut is extending both directions out of the reference plane. Click the green checkmark when you are finished.
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<strong>Step 12:</strong> .
<strong>Step 12:</strong> Click the Section View icon again to see the full drawing again. Hold the Shift key and select both the top face and the extruded cut face as shown in the screenshot below.
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<strong>Step 13:</strong> .
<strong>Step 13:</strong> Go to the Features tab and click the drop-down arrow under Linear Pattern. Click on Circular Pattern. With any luck, both the Boss Extrude and the Cut Extrude will have automatically populated the Features and Faces section in the left column. Choose the Pattern Axis as the edge of the square column that is opposite the Cut Extrude that we performed in a previous step. There's more than one way to get the correct number of instances and spacing. In this example, I chose 4 instances equally spaced over 360 degrees. When everything looks good, click the green checkmark.
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<strong>Step 14:</strong> Select the Top Plane in the Design Tree and start a new sketch by going to the Sketch tab and clicking Sketch. It also helps to be "Normal To" your sketching plane; you can find that icon by clicking on the Top Plane in the Design Tree. On the Sketch tab, click the drop-down arrow next to the rectangle and choose Center Rectangle. Draw a rectangle centered on the origin by clicking on the origin and dragging. Check the "For Construction" box in the left column before clicking the green checkmark. Use the Smart Dimension tool to make the rectangle a square with sides at 10/16 inch.
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<strong>Step 15:</strong> Draw four circles--one centered on each corner of the construction square. Use the Smart Dimension tool to set the diameter of each circle at 1/2 inch.
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<strong>Step 16:</strong> On the Features tab, click the Extruded Cut to create the four drilled holes. There's room for creativity here in choosing the depth of your drilled holes because the depth of the hole directly affects the frequency at which it resonates. For now, set the depth of all four holes to 4 7/16 inches (4.4375 inches).
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<strong>Step 17:</strong> If math equations give you the urge to throw up, you'll definitely want to skip this step.
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<strong>Step 18:</strong> .
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<strong>Step 19:</strong> .
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<strong>Step 20:</strong> .
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<strong>Step 21:</strong> .